-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 1/12/2013 9:05 AM, Anders Wallin wrote: > After seeing the success of a few other people in getting lcnc running on an >> Arm / Beaglebone, I thought I would take a shot at doing the same on the >> Olinuxino, with the intent of driving a 3D printer. I found the Olinuxino >> attractive because it has 512MB RAM and a 1Ghz processor and 3 I2C >> interfaces, as well as a companion 7" LCD or LCD touch display. It does not >> have an immediate interface to get to a Mesa type FPGA device, but I was >> hoping with a 1Ghz processor I would at least be able to directly drive 3 >> stepper motors. >> > > Nice! This is the first project I've seen with an affordable and apparently > good-looking & functional touch screen solution. > > For various embedded projects I've been looking for a board that runs > linuxcnc/HAL, with either on-board IO/Microcontroller/FPGA or the > possibility to use a MESA card. A touch-screen would be used for UI.
The simplest way to do this would probably be to use two systems, one for LinuxCNC and the hardware, and an Android tablet/phone/whatever to run a remote touch-screen interface. For a single-platform ARM solution, TI has another AM335x reference design with a touch-screen that's pretty reasonably priced ($200): http://www.ti.com/tool/tmdssk3358 I'm currently using the 'Bone because: * It's cheaper to start, and I'm not to the point I need a display yet * It has pin headers for I/O expansion * The LCD interface on the AM335x uses the same pins as the PRU direct I/O lines. * I was able to buy a BeBoPr 'shield' which means I don't have to make any custom hardware to get through the first round of testing with an actual 3D printer. The pin muxing issue could probably be worked around somewhat, at the expense of (slightly) worse jitter on the PRU generated step/dir signals, but for initial testing the 'Bone is the easy solution. WARNING: Even with a 1 GHz CPU and Xenomai on the Olinuxino (or any similar development board), I don't think you're going to get latency numbers that work well for (Linux based) software stepgen. You'll probably need either hardware PWM generation (on or off chip), or something like the PRU available in the TI parts that can off-load the step generation from the Linux based servo thread. You could fairly easily do software stepgen with custom code running on the bare metal (ie: no OS), but that kind of defeats the idea of using LinuxCNC. - -- Charles Steinkuehler char...@steinkuehler.net -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (MingW32) Comment: Using GnuPG with undefined - http://www.enigmail.net/ iEYEARECAAYFAlDxf4sACgkQLywbqEHdNFxveACg/pioLkTO4fhtGuzRHoy6zby7 v1MAoI+WVJ+dBK+lI8QLKhkc4TAbBAfX =j0l2 -----END PGP SIGNATURE----- ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. SALE $99.99 this month only -- learn more at: http://p.sf.net/sfu/learnmore_122912 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
